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Digestive System Nervous System

Digestive System Nervous System. The Digestive System

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Text of Digestive System Nervous System. The Digestive System

  • Digestive SystemNervous System

  • The Digestive System

  • Main Parts of the Digestive SystemTEETH mechanical digestion, physically break down food

    SALIVARY GLANDS produce saliva (spit) which mixes with food; releases an enzyme that begins chemical digestion

    ESOPHAGUS long, straight tube which connects the throat to the stomach

  • Main Parts of the Digestive SystemSTOMACH muscular, baglike organphysical digestion muscles squeeze food chemical digestion - glands in stomach produce enzymes and acids, break down food into nutrients

    CHYME soupy mixture made in stomach; slowly released to small intestine

  • Main Parts of the Digestive SystemSMALL INTESTINE 6 meter muscular tube connected to stomach; mixes chyme with fluids from liver and pancreas

    VILLI line the small intestine; absorb nutrients from the chyme and send to bloodstream

  • Main Parts of the Digestive SystemPANCREAS fish-shaped organ between stomach and small intestines; makes juices which flow to small intestine to neutralize acid

    LIVER large organ on right side above stomach; MAKES bile (breaks up fat); breaks down toxic substances (ALCOHOL and DRUGS)

    GALLBLADDER small baglike organ; STORES bile, then squeezed into small intestine

    These organs are linked to the small intestine, but food DOES NOT move through them

  • Main Parts of the Digestive SystemLARGE INTESTINE (COLON) 1.5 m organ that stores, compacts, and gets rid of anything left that the body doesnt need; 7.5 cm diameter (LARGE)

    RECTUM last part of large intestine; stores feces

    ANUS opening of rectum

    Digestion takes 24 hours!!!

  • The Nervous System

  • The Nervous SystemCENTRAL NERVOUS SYSTEM (CNS) brain and spinal cord; processes incoming/outgoing messages

    PERIPHERAL NERVOUS SYSTEM (PNS) nerves that connect all areas of your body to CNS

  • Peripheral Nervous SystemNEURONS cells that transfer messages throughout the body; fast-moving electrical energy

  • Neuron StructureDENDRITES bring messages INTO cell bodyCELL BODY main part of neuron (contains nucleus)AXONS carry messages AWAY from cell body

  • Types of Neurons SENSORY NEURONS gather info about what is happening using receptors; send to CNS; INMOTOR NEURONS - send impulses from brain and spinal cord for muscles to move; OUT

  • NervesAxons bundled together with blood vessels and tissueTransmits info from spinal cord to body

  • Central Nervous SystemBRAIN largest organ; 3 parts

    CEREBRUM thoughts, memories, senses

    CEREBELLUM balance

    MEDULLA brain stem; involuntary activity (blood pressure, heart rate, breathing); connects to spinal cord

  • Central Nervous SystemSPINAL CORD contains neurons and bundles of axons that pass info to and from brain

    VERTEBRAE protective bones around spinal cord